Autotrophic Nutrition

Nutrition Nutrition: an organism’s ability to obtain and process materials needed for energy, growth, repair and regulation. Two type of nutrition: heterotrophic autotrophic

Autotrophic Nutrition Autotrophs produce their own food (sugar) from inorganic compounds. Autotrophs produce sugar through the process of PHOTOSYNTHESIS

What is Photosynthesis? Photosynthesis: plants use energy from the sunlight to convert carbon dioxide (CO2) and water into oxygen (O2) and sugar. The equation for photosynthesis: 6 CO2 + 6 H2O C6H12O6 + 6 O2

Where does photosynthesis occur? In the chloroplasts! Remember the elodea?

Structure of the Chloroplast

Structure of Chloroplast The chloroplast is surrounded by a double membrane. Thylakoid = membrane that contains CHLOROPHYLL Grana = stack of thylakoids Stroma = fluid portion of the chloroplast

Chlorophyll Chlorophyll is the major pigment that traps energy from sunlight There are other pigments that help out chlorophyll

Photosynthesis Overview

Light-Dependent Reactions Photolysis – energy from the sun is used to split H2O O2 is released ATP and NADPH (electron carrier) are made

Calvin Cycle Uses the ATP and NADPH made in the light-dependent reaction CO2 is used to make SUGAR

The Leaf The CO2 required by the plant enters through stoma (tiny openings under the leaf)

Guard Cells: open and close the stoma on a leaf

Plants convert light energy into chemical energy through the process of PHOTOSYNTHESIS. This is AUTOTROPHIC NUTRITION

Guard Cell Stoma